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论文类型：期刊论文

发表时间：2018-12-01

发表刊物：LASER AND PARTICLE BEAMS

收录刊物：SCIE

卷号：36

期号：4

页面范围：470-476

ISSN号：0263-0346

关键字：Beam displacement; beam divergence; energy density; focusing; pulsed neutralized ion beam; space charge; statistical analysis of the ion beam parameters

摘要：The paper presents the results of a study on propagation and focusing of high-intensity pulsed ion beams, produced by a self-magnetically insulated diode of semi-cylindrical geometry at the TEMP-6 accelerator (120 ns, 200-250 kV). We examined the space-charge neutralization of the beam, the energy density in the focus, the divergence of the beam, and its shot-to-shot displacement in the focal plane. It is found that the concentration of low-energy electrons in the beam is 1.3-1.5 times higher than the concentration of ions. We observed additional ion focusing by its own space charge. With an increase in the density of the net negative (electrons and ions) charge of the beam from 3.6 to 9 mu C/cm(2), the total divergence (the sum of the beam divergence in the vertical and horizontal planes) decreases from 11.4 to 4.5 degrees. It leads to an increase in the energy density in the focus from 4 up to 10-12 J/cm(2). To increase the electrons concentration in the beam, a metal grid installed in the ion beam transport region was used.